Neurons in virtually every brain area use these neurotransmitters to communicate with other neurons. They are

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Glutamate is the primary excitatory neurotransmitter in the brain, while GABA is the primary inhibitory neurotransmitter. Thus, neurons in virtually every brain area use these neurotransmitters to communicate with other neurons.

Note: While acetylcholine and serotonin are important neurotransmitters in the brain, they are not as ubiquitous as glutamate and GABA in terms of being used by neurons throughout the brain. Similarly, while dopamine plays an important role in certain brain areas (such as the reward system), it is not used by neurons throughout the brain in the same way that glutamate and GABA are.

Neurons in Virtually Every Brain Area Use These Neurotransmitters to Communicate